Kenshin's Rurouni Kenshin Chinese Webpage ~ A comprehsive and updated Kenshin Webpage ^.^ English version here.

Battousai no Miko's Shrine to Battousai ~ It has a page particularly about Tomoe(Kenshin's wife) and manga scan of Kenshin's past. ^.^

The Kenshin Archive ~ Have anime and manga images, as well as manga translation

 

Feeling: Ruroni Kenshin ~ Lots of stuff to download about Kenshin.

The Kenshin Gallery ~ One of the most complete Rurouni Kenshin image archives.

Fanfics Websites:

 

Hiten Mitsurugi Ryuu - Rurouni Kenshin Fanfictin Archive

- Included a massive collection of RK fanfics by different authors. They are sorted and categorised, so it's easy to look for the type of fanfic you want to read.

 

Rurouni Kenshin Fanfiction Collection (Rising Sun)

The owner of this webpage, Mana-chan has included her works in there as well as many RK fanfics by various authors, and they are mainly romance.

 

Youko Mitsuki's Fanfiction Shrine

This webpage fanfics of RK, Gundam Wing, Yu Yu Hakusho, etc.

 

浪客劍心-神劍闖江湖之頁－緋色之劍

It's chinese fanfics collection is possibly the biggest you can find on the Internet.